A wide, flat plowshare (the cutting blade of a plow) used in agricultural tillage.
From 'broad' + 'share' (from Old English scear, the blade of a plow). This agricultural term appears in farming manuals and texts describing different plow configurations for various soil types.
Different soil requires different plow designs—narrow shares cut through clay, while broad shares spread and overturn the soil better in sandy or rocky fields. Medieval farmers were sophisticated materials engineers.
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